diff --git a/pyproject.toml b/pyproject.toml
index 86d71bba..f56affcb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "hatchling.build"
 [project]
 name = "kohlrahbi"
 description = "Tool to generate machine readable files from AHB documents"
-license = { text = "MIT" }
+license = { text = "GPL" }
 requires-python = ">=3.11"
 authors = [{ name = "Kevin Krechan", email = "kevin.krechan@hochfrequenz.de" }]
 keywords = ["automation", "ahb", "bdew", "edi@energy"]
@@ -20,7 +20,7 @@ classifiers = [
   "Development Status :: 4 - Beta",
   "Environment :: Console",
   "Intended Audience :: Developers",
-  "License :: OSI Approved :: MIT License",
+  "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3 :: Only",